'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Element Admin' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following method:
// port = 9527 npm run dev OR npm run dev --port = 9527
const port = process.env.port || process.env.npm_config_port || 9527 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    devtool: 'cheap-module-source-map',
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack(config) {
    //   // it can improve the speed of the first screen, it is recommended to turn on preload
    //   // it can improve the speed of the first screen, it is recommended to turn on preload
    //   config.plugin('preload').tap(() => [
    //     {
    //       rel: 'preload',
    //       // to ignore runtime.js
    //       // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
    //       fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
    //       include: 'initial'
    //     }
    //   ])

    //   // when there are many pages, it will cause too many meaningless requests
    //   config.plugins.delete('prefetch')

    //   // set svg-sprite-loader
    //   config.module
    //     .rule('svg')
    //     .exclude.add(resolve('src/icons'))
    //     .end()
    //   config.module
    //     .rule('icons')
    //     .test(/\.svg$/)
    //     .include.add(resolve('src/icons'))
    //     .end()
    //     .use('svg-sprite-loader')
    //     .loader('svg-sprite-loader')
    //     .options({
    //       symbolId: 'icon-[name]'
    //     })
    //     .end()

    //   config
    //     .when(process.env.NODE_ENV !== 'development',
    //       config => {
    //         config
    //           .plugin('ScriptExtHtmlWebpackPlugin')
    //           .after('html')
    //           .use('script-ext-html-webpack-plugin', [{
    //             // `runtime` must same as runtimeChunk name. default is `runtime`
    //             inline: /runtime\..*\.js$/
    //           }])
    //           .end()
    //         config
    //           .optimization.splitChunks({
    //             chunks: 'all',
    //             cacheGroups: {
    //               libs: {
    //                 name: 'chunk-libs',
    //                 test: /[\\/]node_modules[\\/]/,
    //                 priority: 10,
    //                 chunks: 'initial' // only package third parties that are initially dependent
    //               },
    //               elementUI: {
    //                 name: 'chunk-elementUI', // split elementUI into a single package
    //                 priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
    //                 test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
    //               },
    //               commons: {
    //                 name: 'chunk-commons',
    //                 test: resolve('src/components'), // can customize your rules
    //                 minChunks: 3, //  minimum common number
    //                 priority: 5,
    //                 reuseExistingChunk: true
    //               }
    //             }
    //           })
    //         // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
    //         config.optimization.runtimeChunk('single')
    //       }
    //     )
    // }

    // 压缩代码
    config.optimization.minimize(true)
    // splitChunks 分包
    config
      .optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            minChunks: 1,
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10
          },
          elementUI: {
            minChunks: 1,
            name: 'chunk-elementUI',
            priority: 60,
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/,
            chunks: 'initial'
          },
          eCharts: {
            name: 'chunk-eCharts',
            test: /[\\/]node_modules[\\/]_?echarts(.*)/,
            priority: 60,
            chunks: 'initial'
          },
          zrender: {
            name: 'chunk-zrender',
            test: /[\\/]node_modules[\\/]_?zrender(.*)/,
            priority: 60,
            chunks: 'initial'
          },
          commons: {
            minChunks: 2,
            name: 'chunk-commons',
            test: resolve('src/components'),
            chunks: 'async',
            priority: 1
          }
        }
      })
    config.optimization.runtimeChunk('single')
  }
}
